if service.isUseAccessibilityVolume() or service.isUseAsyncAccessibilityVolume() service.setUseAccessibilityVolume(false) service.setAsyncUseAccessibilityVolume(false) service.speak "menggunakan volume media" elseif not service.isUseAccessibilityVolume() or not service.isUseAsyncAccessibilityVolume() service.setUseAccessibilityVolume(true) service.setAsyncUseAccessibilityVolume(true) service.speak "menggunakan volume aksesibilitas" end return true